Influence of the Cooling Method of the Molten Pool on the Laminating Characteristics in Direct Metal Lamination by Using Arc Discharge

概要

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Recently, the direct molding machine of the metal product is utilized, but the fabricating device and the materials are very expensive, also the kinds of the materials are limited, in comparison with the machining of bulk material. In this paper, a new metal laminating modeling by using an arc discharge is proposed to achieve the near-net-shape molding. On this process, as the heat input from arc discharge is large, some cooling should be necessary to prevent overheating of the fabricating product and the machine. But the cooling rate of the molten pool, where the molten metal is dropped from the tip of the welding torch, affects the shape of the fabricated product. Then the laminating characteristics of the two types of cooling, namely water cooling and an air cooling were investigated. It was shown that the laminating height becomes high and the width becomes narrow when the cooling rate of the molten pool is higher. These results can be helpful for higher modeling accuracy using this direct metal lamination process.